Stove

Abstract

A pan comprising a base, the base comprising: an inner base, the upper surface of which has a first curved surface concave at least in its central region; an outer base connected with a lower surface of the inner base, the lower surface of the outer base having a second curved surface concave at least in its central region; an intercalated layer sandwiched between the inner and outer bases, the intercalated layer having a coefficient of thermal expansion greater than the coefficient of thermal expansion of both the inner and outer bases. Figure for the abbreviation: Figure 1

Description

Title of the invention: Stove

[0001] The present application relates to the technical field of kitchen utensils and in particular a frying pan.

[0002] Existing pans can be classified into conventional pans and oil-collecting pans according to the bottom structure. The bottom of a conventional pan is generally flat or slightly curved upward. During cooking, the bottom deforms upward when heated, causing oil to disperse toward the periphery of the pan. This makes heat control difficult and ingredients burn easily. An oil-collecting pan generally has a concave inner bottom. During cooking, the bottom deforms downward when heated, forming an outwardly convex bottom that could cause the pan to rotate on a supporting surface. Thus, existing pans are found to be easily deformed during use and have poor bottom stability.

[0003] The present invention provides a pan for solving the problem of deformation of the bottom of the pan by improving its stability.

[0004] The present invention provides a pan comprising a base, the base comprising:

[0005] - an inner base, an upper surface of which is provided with a first surface curved concave at least in its central region;

[0006] - an outer bottom connected with a lower surface of the inner bottom, a lower surface of the outer bottom being provided with a second concave curved surface at least in its central region;

[0007] - an interlayer sandwiched between the inner bottom and the outer bottom, the interlayer having a coefficient of thermal expansion greater than the coefficient of thermal expansion of the inner base and the coefficient of thermal expansion of the outer base.

[0008] The bottom of the pan according to the present invention comprises an inner bottom, an outer bottom and an interlayer. The upper surface of the inner bottom is provided with a first concave curved surface at least in its central region. The first curved surface can achieve an oil collecting effect. The outer bottom is connected with the lower surface of the inner bottom and a second concave curved surface is provided at least in the central region of the lower surface of the outer bottom. The second curved surface forms a recess in the central region of the outer bottom, which prevents the pan from rotating. The interlayer is disposed between the inner bottom and the outer bottom and the coefficient of thermal expansion is greater than the coefficient of thermal expansion of the inner bottom and the coefficient of thermal expansion of the outer bottom, so that the The interlayer and the inner bottom, and the interlayer and the outer bottom, respectively form two bimetallic strips, and the inner bottom and the outer bottom tend to deform in opposite directions. Thus, the deformation of the inner bottom and the deformation of the outer bottom can at least partially compensate each other, thereby solving the problem of pan bottom deformation and improving the stability of the pan bottom.

[0009] Optionally, the coefficient of thermal expansion of the inner bottom is greater than the coefficient of thermal expansion of the outer bottom. Thus, the deformation tendency of the inner bottom is as close as possible to the deformation tendency of the outer bottom, so that the deformation of the inner bottom and the deformation of the outer bottom compensate each other as much as possible, thereby reducing or eliminating the overall deformation of the bottom of the pan.

[0010] Optionally, the depression depth of the first curved surface is greater than the depression depth of the second curved surface, thereby ensuring a reliable oil collection effect and effectively preventing the pan from rotating.

[0011] Optionally, the depression depth of the first curved surface is Hl, and the depression depth of the second curved surface is H2 such that Hl = y*H2, 3 <y<6. Pour une profondeur de dépression globale du fond de la poêle inchangée, une répartition plus raisonnable des profondeurs des dépressions respectives dans les fonds intérieur et extérieur permet d’assurer un effet fiable de collecte de l'huile et d’empêcher la poêle de tourner à causer d’un fond convexe vers le bas.

[0012] Optionally, the diameter of the outer bottom is Dl, and the thickness of the bottom of the pan in the center is Tl such that Tl = k*Dl, 0.01 <k<0,03, ce qui permet d’empêcher la déformation du fond de la poêle et d’assurer la commodité d’usage.

[0013] Optionally, the thickness of the bottom of the pan at the midpoint of the radius of the inner bottom is T2 such that T2 = Tl + a*Dl, 0.005 <a<0,01, ce qui permet d’assurer un effet fiable de collecte de l'huile et une distribution uniforme de la chaleur pour améliorer les résultats de cuisson.

[0014] Optionally, the vertical distance between an edge of the upper surface of the inner bottom and an edge of the lower surface of the outer bottom is T3 such that T3 = T2 + |3*D1, 0.007<[3<0.012, which ensures a reliable oil collection effect and uniform heat distribution.

[0015] Optionally, the thickness Tl of the bottom of the pan in the center is greater than or equal to 2.5 mm in order to prevent the thickness of the bottom of the pan in the center from being too small, which would result in the bottom of the pan itself being too small and having insufficient resistance to deformation.

[0016] Optionally, the thickness of the bottom of the pan in the center is such that 2.5 mm <T1<4 mm. Le fond de la poêle doit être aussi fin que possible pour réduire le poids total de la poêle ;

[0017] The thickness of the inner bottom is 0.5 mm to 0.8 mm and the thickness of the outer bottom is 0.5 mm to 0.8 mm, which enables the bottom of the pan to be processed and formed according to predetermined requirements and to be resistant to deformation.

[0018] Optionally, the thickness of the bottom of the pan in the center is such that Tl> 4 mm. By adopting a thicker bottom, it is ensured that the bottom of the pan has sufficient resistance to deformation in order to prevent deformation of the bottom of the pan;

[0019] The thickness of the inner bottom is 0.5 mm to 1.2 mm, and the thickness of the outer bottom is 0.5 mm to 1.2 mm, which enables the bottom of the pan to be processed and formed according to provided requirements and is resistant to deformation.

[0020] It is noted that the above general description and the following detailed description are given by way of example and do not limit the present invention. Brief description of the figures

[0021] [Fig.l] is a schematic structural view of a pan provided by an embodiment of the present invention.

[0022] List of references: 1 - inner background; 2 - outer bottom; 21 - extension; 3 - interlayer

[0023] The figures, which are incorporated and constitute a part of the description, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention. Detailed description

[0024] The present invention will be described in more detail below with reference to the figures and embodiments, and the objectives, technical solutions, and advantages of the invention will become more clearly apparent. It is understood that the specific embodiments described herein are for the sole purpose of explaining the present invention and are not intended to limit it.

[0025] In the description of the present application, unless otherwise explicitly indicated or limited, the terms "first" and "second" are used for descriptive purposes and should not be interpreted as indicating or implying relative importance. Unless otherwise indicated or described, the term "multiple" means two or more; the terms "connection", "fixed", etc. are to be understood in a broad sense. For example, a "connection" may be a fixed connection, a connection detachable or an integral connection, or an electrical connection; it may be direct or indirect through an intermediate support. For those skilled in the art, the specific meaning of the above terms in the present application may be understood depending on the specific circumstances.

[0026] In the description, it is understood that orientation terms, such as "top" and "bottom", used in describing the embodiments of the present application are described from the perspective shown in the figures and should not be interpreted as a limitation of the embodiments of the present invention. Furthermore, it is understood in the context that when an element is said to be connected "on" or "under" another element, it may not only be directly connected "on" or "under" the other element, but may also be indirectly connected "on" or "under" the other element via an intermediate element.

[0027] As illustrated in [Fig.l], one embodiment of the present invention provides a pan comprising a bottom and a wall which are connected to each other. The bottom of the pan and the pan wall together form a cavity for receiving food. A handle may be provided outside the pan wall to facilitate gripping and lifting of the pan by a user.

[0028] The bottom of the pan comprises an inner bottom 1, an outer bottom 2 and an interlayer 3. The upper surface of the inner bottom 1 is provided with a first curved surface concave inward (concave downward) at least in its central region. The first curved surface can achieve an oil collecting effect. The outer bottom 2 is connected with the lower surface of the inner bottom 1, and the lower surface of the outer bottom 2 is provided with a second curved surface concave inward, at least in its central region. The second curved surface forms a recess in the central region of the outer bottom 2, which prevents the pan from rotating. The interlayer 3 is sandwiched by the inner bottom 1 and the outer bottom 2.The thermal expansion coefficient of the interlayer 3 is greater than the thermal expansion coefficient of the inner bottom 1 and the thermal expansion coefficient of the outer bottom 2, so that the interlayer 3 and the inner bottom 1, and the interlayer 3 and the outer bottom 2, respectively form two bimetallic strips, and the inner bottom 1 and the outer bottom 2 tend to deform in opposite directions. Thus, the deformation of the inner bottom 1 and the deformation of the outer bottom 2 at least partially compensate each other, thereby solving the problem of deformation of the pan bottom and improving the stability of the pan bottom.

[0029] More precisely, since the coefficient of thermal expansion of the interlayer 3 is greater than that of the inner bottom 1, during heating, the deformation of the interlayer 3 is greater than that of the inner bottom 1, so that the interlayer 3 and the inner bottom 1 tend to bend to deform upwards. Similarly, since the coefficient of thermal expansion of the interlayer 3 is greater than that of the outer bottom 2, during heating, the deformation of the interlayer 3 is greater than that of the outer bottom 2, so that the interlayer 3 and the outer bottom 2 tend to bend to deform downwards. Because the inner bottom 1 and the outer bottom 2 tend to deform in opposite directions, the deformations of the inner bottom 1 and the outer bottom 2 can at least partially compensate each other. When the deformation of the inner bottom 1 is greater than that of the outer bottom 2, the bottom of the pan exhibits an overall bending or deformation upwards.In this case, the depression depth of the first curved surface increases slightly and the depression depth of the second curved surface decreases slightly. When the deformation of the inner bottom 1 is less than that of the outer bottom 2, the bottom of the pan exhibits an overall downward bending or deformation. In this case, the depression depth of the first curved surface decreases slightly and the depression depth of the second curved surface increases slightly. When the deformation of the inner bottom 1 is equal to that of the outer bottom 2, the bottom of the pan exhibits almost no overall deformation. In this case, the depression depth of the first curved surface and the depression depth of the second curved surface remain unchanged.

[0030] In this embodiment, the inner bottom 1 is formed by stretching a metal sheet, and may be formed integrally with the pan wall to increase the continuity and integrity of the inner surface of the pan bottom. The outer bottom 2 may also be formed by stretching a metal sheet. The edge of the outer bottom may be provided with an upwardly facing extension 21 and connected to the inner bottom 1 by means of the extension 21. A cavity is formed between the outer bottom 2 and the inner bottom 1. The interlayer 3 fills the cavity. Thus, the inner bottom 1, the outer bottom 2 and the interlayer 3 together form a composite bottom of the pan.

[0031] With the thermal expansion coefficient of the inner bottom 1 being higher than that of the outer bottom 2, the deformation tendency of the inner bottom 1 can be as close as possible to the deformation tendency of the outer bottom 2, so that the deformation of the inner bottom 1 and the deformation of the outer bottom 2 compensate each other to the greatest extent, thereby reducing the overall deformation of the pan bottom. Specifically, when heating, the outer bottom 2 is in direct contact with the heat source and transfers heat to the inner bottom 1 through the interlayer 3, so that the temperature of the outer bottom 2 is higher than that of the inner bottom 1. If the thermal expansion coefficient of the inner bottom 1 is equal to that of the outer bottom 2, the deformation tendency of the outer bottom 2 will be significantly greater than that of the inner bottom 1. By choosing a material with a lower coefficient of thermal expansion for the outer bottom 2 which has a higher temperature, and choosing a material with a higher coefficient of thermal expansion for the inner bottom 1 which has a lower temperature, it is possible to make the deformations of the two bottoms more convergent, which makes it possible to reduce or eliminate the overall deformation of the bottom of the pan.

[0032] Specifically, the inner bottom 1 can be made of 316 stainless steel sheet, with a thermal expansion coefficient of about 16*10 6 / °C; the outer bottom 2 can be made of 430 stainless steel sheet, with a thermal expansion coefficient of about 10*10 6 / °C; the interlayer 3 can be made of 1050 pure aluminum, with a thermal expansion coefficient of about 23*10 6 / °C. While ensuring reliable oil collection and good deformation resistance, the use of 316 stainless steel and 443 stainless steel makes it possible to obtain good corrosion resistance. In addition, the use of pure aluminum makes it possible to obtain good thermal conductivity and better uniformity of heat distribution. Of course, the inner bottom 1, the outer bottom 2 and the intermediate layer 3 can also be made of other suitable materials as required.

[0033] In this embodiment, the depression depth of the first curved surface is greater than that of the second curved surface, thereby ensuring a reliable oil collection effect and effectively preventing the pan from rotating. Specifically, the inner bottom 1 may be provided with a larger depression to ensure that the central region of the bottom of the pan collects a sufficient amount of cooking oil, thereby avoiding problems such as burnt food. The outer bottom 2, on the other hand, only needs a smaller depression to be able to separate the central region from a supporting surface and thus prevent the pan from rotating.

[0034] More precisely, by the depression depth of the first curved surface is meant the vertical distance between the lowest point of the first curved surface and the highest point of the inner bottom 1. Similarly, by the depression depth of the second curved surface is meant the vertical distance between the highest point of the second curved surface and the lowest point of the outer bottom 2.

[0035] In this case, the depression depth of the first curved surface is Hl, and the depression depth of the second curved surface is H2 such that Hl = y*H2, 3 <y<6. Par exemple, H1=3H2, H1=3,5H2, Hl= 4H2, Hl= 4,5H2, H1=5H2, H1=5,5H2 ou H1=6H2, etc. Pour une profondeur globale de dépression du fond de la poêle inchangée, une répartition raisonnable des profondeurs des dépressions respectives dans le fond intérieur 1 et le fond extérieur 2 permet d’assurer une collecte reliable oil collection and prevent the pan from rotating due to a downward convex bottom. When H1<3H2, the depression depth of the first curved surface is too shallow, it is difficult to meet the requirements of the oil collection effect. When H1>6H2, the depression depth of the second curved surface is too shallow, which results in a convex bottom phenomenon at the beginning of heating due to the deformation of the outer bottom 2, which is the first to be deformed by heat.

[0036] The diameter of the outer bottom 2 is DI and the thickness of the bottom of the pan in the center (denoted the thickness of the center) is Tl, whatever Tl=k*Dl, 0.01 <k<0,03. Par exemple, Tl=0,01Dl, Tl=0,015Dl, Tl=0,02Dl, Tl=0,025Dl ou Tl=0,03Dl, etc. Ceci permet d’empêcher la déformation du fond de la poêle et d’assurer la commodité d'utilisation. Lorsque Tl<0,01Dl, l'épaisseur au centre du fond de la poêle est trop fine, ce qui rend le fond de la poêle lui-même trop faible et donc susceptible de se déformer. Lorsque Tl> 0.03Dl, the thickness in the center of the bottom of the pan is too large, which makes the pan too heavy as a whole and affects its ease of use.

[0037] Furthermore, the thickness of the bottom of the pan at the midpoint of the radius of the inner bottom 1 (denoted the thickness at the midpoint of the radius) is T2, such that T2=Tl+a*Dl, 0.005 <a<0,01. Par exemple, T2=Tl+0,005Dl, T2= Tl+0,006Dl, T2=Tl+0,007Dl, T2=Tl+0,008Dl, T2=Tl+0,009Dl ou T2=T1+O,O1D1, etc. Ceci permet d’assurer un effet fiable de collecte de l'huile et une distribution uniforme de la chaleur pour améliorer les résultats de cuisson. Lorsque T2<T1+0,005*D1, le changement d'épaisseur dans la région centrale du fond de la poêle est trop doux, ce qui entraîne une dépression trop faible dans le fond de la poêle, affectant ainsi l'effet de collecte de l'huile. Lorsque T2> T1+O,O1*D1, the thickness change in the central region of the pan bottom is too large, resulting in uneven heat distribution and affecting cooking results.

[0038] In addition, the vertical distance between the edge of the upper surface of the inner bottom 1 and the edge of the lower surface of the outer bottom 2 (denoted by the thickness at the edge) is T3 regardless of T3=T2+[3*D1, 0.007<[3<0.012. For example, T3=T2+0.007Dl, T3=T2+0.008Dl, T3=T2+0.009Dl, T3=T2+0.01Dl, T3=T2+0.011Dl or T3=T2+ 0.012Dl, etc. This ensures a reliable oil collection effect and uniform heat distribution. When T3 <T2+0,007Dl, davantage de l'huile de cuisson a tendance à rester dans une région périphérique du fond de la poêle, ce qui rend difficile la collecte de l'huile de cuisson dans la région centrale du fond de la poêle, affectant l'effet de collecte de l'huile. Lorsque T3> T2+0.012Dl, the thickness of the peripheral region of the bottom of the pan is too large, which causes uneven heat distribution and affects the cooking results.

[0039] In addition, the thickness Tl of the bottom of the pan in the center is greater than or equal to 2.5 mm. For example, the thickness Tl of the bottom of the pan in the center may be 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm or 7 mm, etc. If the thickness of the bottom of the pan in the center is too thin, the bottom of the pan itself would be too weak and have insufficient resistance to deformation.

[0040] In one embodiment, the thickness of the bottom of the pan in the center is such that 2.5 mm < Tl < 4 mm. For example, the thickness Tl of the bottom of the pan in the center may be 2.5 mm, 2.8 mm, 3 mm, 3.3 mm, 3.5 mm, 3.8 mm or 4 mm, etc. The thickness of the bottom of the pan may be as small as possible to reduce the overall weight of the pan. The thickness of the inner bottom 1 is 0.5 mm to 0.8 mm. For example, the thickness of the inner bottom 1 may be 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm or 0.8 mm, etc. The thickness of the outer bottom 2 is 0.5 mm to 0.8 mm. For example, the thickness of the outer bottom 2 may be 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm or 0.8 mm, etc. This allows the bottom of the pan to be processed and formed according to predetermined requirements, and to be resistant to deformation.Note that the inner bottom 1 and the outer bottom 2 are each formed by stretching sheet metal, when the thickness of the inner bottom 1 or the thickness of the outer bottom 2 is less than 0.5 mm, the sheet metal would be too thin and thus difficult to form by stretching. When the thickness of the inner bottom 1 or the thickness of the outer bottom 2 is greater than 0.8 mm, the interlayer 3 would be too thin, and thus the structural strength of the interlayer 3 itself would be too low, which cannot meet the deformation resistance requirements of the pan bottom.

[0041] In another embodiment, the thickness Tl of the bottom of the pan in the center is such that Tl > 4mm. For example, the thickness Tl of the bottom of the pan in the center may be 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm or 7mm, etc. The thickness of the bottom of the pan may also be greater to ensure sufficient resistance to deformation and to prevent deformation of the bottom of the pan. The thickness of the inner bottom 1 is 0.5mm to 1.2mm. For example, the thickness of the inner bottom 1 may be 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1.0 mm, 1.05 mm, 1.1 mm, 1.15 mm or 1.2 mm, etc. The thickness of the outer bottom 2 is 0.5 mm to 1.2 mm. For example, the thickness of the outer bottom 2 may be 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1.0 mm, 1.05 mm, 1.1 mm, 1.15 mm or 1.2 mm, etc.This allows the pan bottom to be processed and formed according to the predetermined requirements, and to be resistant to deformation. If the thickness of the inner bottom 1 or the thickness of the outer bottom 2 is less than 0.5 mm, the sheet would be too thin and thus difficult to form by stretching. If the thickness of the inner bottom 1 or the thickness of the outer bottom 2 is greater than 1.2 mm, the interlayer 3 would be too thin, and thus the structural strength of the interlayer 3 itself would be too low, thus failing to meet the deformation resistance requirements of the pan bottom.

[0042] Taking a frying pan having a diameter of 24 cm as an example, the specific structure of the pan according to one embodiment of the present invention may be as follows:

[0043] the thickness of the inner bottom 1 is 0.6 mm, and the depression depth of the inner bottom 1 is H1 = 2.5 mm;

[0044] the thickness of the outer bottom 2 is 0.5 mm, the depression depth of the outer bottom 2 is H2 = 0.6 mm, and the diameter of the outer bottom 2 is DI = 172 mm;

[0045] the thickness at the center Tl = 3 mm, the thickness at the midpoint of the radius T2 = 4.4 mm, and the thickness at the edge T3 = 6.1 mm.

[0046] The foregoing is only a preferred embodiment of the present invention and is not intended to limit the present invention, which is subject to various modifications and variations for those skilled in the art. All modifications, equivalent substitutions, improvements, etc. made in the spirit and according to the principles of the present invention are to be included within the scope of protection of the present application.

Claims

Claims

1. A pan, characterized in that it comprises a bottom, the bottom comprising: - an inner bottom (1), an upper surface of which is provided with a first concave curved surface at least in its central region; - an outer bottom (2) connected with a lower surface of the inner bottom (1), a lower surface of the outer bottom (2) being provided with a second concave curved surface at least in its central region; - an interlayer (3) sandwiched between the inner bottom (1) and the outer bottom (2), the interlayer (3) having a coefficient of thermal expansion greater than the coefficient of thermal expansion of the inner bottom (1) and the coefficient of thermal expansion of the outer bottom (2).

2. The pan according to claim 1, characterized in that the coefficient of thermal expansion of the inner bottom (1) is greater than the coefficient of expansion of the outer bottom (2).

3. The pan according to claim 1, characterized in that the depression depth of the first curved surface is greater than the depression depth of the second curved surface.

4. The pan according to claim 3, characterized in that, the depression depth of the first curved surface is Hl, and the depression depth of the second curved surface is H2 such that: Hl = y*H2, 3 <y<6.

5. The pan according to claim 1, characterized in that the diameter of the outer bottom (2) is Dl, and the thickness of the bottom of the pan in the center is Tl such that: Tl =k*Dl, 0.01 <k<0,03.

6. The pan according to claim 5, characterized in that the thickness of the bottom of the pan in the middle of the radius of the inner bottom (1) is T2 such that: T2 = Tl + a*Dl, 0.005 <a<0,01.

7. The pan according to claim 6, characterized in that the vertical distance between an edge of the upper surface of the inner bottom (1) and an edge of the lower surface of the outer bottom (2) is T3 such that: T3 = T2 + |3*D1, 0.007<[3<0.

012.

8. The pan according to any one of claims 1 to 7, characterized in that the thickness Tl of the bottom of the pan in the center is greater than or equal to 2.5 mm.

9. The pan according to claim 8, characterized in that the thickness of the bottom of the pan in the center is such that 2.5 mm <Tl<4 mm, l'épaisseur du fond intérieur (1) étant de 0,5 mm à 0,8 mm, et l'épaisseur du fond extérieur (2) étant de 0,5 mm à 0,8 mm.

10. The pan according to claim 8, characterized in that the thickness of the bottom of the pan in the center is such that Tl>4 mm, the thickness of the inner bottom (1) being from 0.5 mm to 1.2 mm, and the thickness of the outer bottom (2) being from 0.5 mm to 1.2 mm.

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